The word 'interested' is an adjective. The past participle of a verb is also an adjective, a word that describes a noun. Examples:
Verb: He was interested in the newest model.
Adjective: An interested partycontacted our realtor today.
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The adjective form of concept is conceptual.The adjective form of conception is conceptional.
The adjective form for the pronoun they is their.
The adjective form of concept is conceptual.The adjective form of conception is conceptional.
The adjective form is decisive.
The adjective form for the noun need is needy.The adjective form for the verb to need is needed.